Measurement and Instrumentation

71. The electrical power to a meggar is provided by

1. battery
2. permanent magnet D.C. generator
3. AC. generator
4. any of the above

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72. The function of shunt in an ammeter is to

1. by pass the current
2. increase the sensitivity of the ammeter
3. increase the resistance of ammeter
4. none of the above

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73. The gravity controlled instrument has crowded scale because current is proportional to

1. balancing weight
2. deflection angle
3. sine of deflection angle
4. none of the above

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74. The household energy meter is

1. an indicating instrument
2. a recording instrument
3. an integrating instrument
4. none of the above

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75. The multiplier and the meter coil in a voltmeter are in

1. series
2. parallel
3. series-parallel
4. none of the above

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76. The operating voltage of a meggar is about

1. 6 V
2. 12 V
3. 40 V
4. 100 V

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77. The pointer of an indicating instrument should be

1. very light
2. very heavy
3. either (a) or (b)
4. neither (a) nor (b)

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78. The power factor of a single phase load can be calculated if the instruments available are

1. one voltmeter and one ammeter
2. one voltmeter, one ammeter and one wattmeter
3. one voltmeter, one ammeter and one energy meter
4. any of the above

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79. The power of a n-phase circuit can be measured by using a minimum of

1. (n – 1) wattmeter elements
2. n wattmeter elements
3. (n + 1) wattmeter elements
4. 2n wattmeter elements

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80. The pressure coil of a wattmeter should be connected on the supply side of the current coil when

1. load impedance is high
2. load impedance is low
3. supply voltage is low
4. none of the above

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